Looking for a new YZ400 Rod kit or Crank

[Simo63]

they are 130 mm long . 83 yz 250

Is that end to end?  Because the 400 one is  166.5mm long

rods are measured centre to centre. no 400- 500 rod is i66 long. cr500s are 144 ish
that's the longest that I know of

Fair enough, I'll get him to measure it again and get back to me

[Simo63]

http://s1008.photobucket.com/user/Arn5400/media/IMG_2745_zps74de1737.jpg.html?sort=3&o=1

the little end bearing you have to use is for the same as rod of a yz250 83 on. big end is same
I haven't tried this but it  seems to work

Is the rod on the right the replacement? Seems to have more meat around the bearing journals.

[sleepy]

Full NOS kit

http://www.ebay.com.au/itm/Yamaha-YZ360-RT1-YZ250-RT3-YZ400-DT360-Connecting-Rod-KIT-Genuine-OEM-NOS-NEW-/201163502656?_trksid=p2054897.l4275


http://www.ebay.com.au/itm/Yamaha-DT250-MX-DT-250-MX250-Rod-Kit-NEW-/171239081129?pt=Motorcycles_Parts_Accessories&hash=item27dea504a9

The first option is a lot of dollars just to be able to use the letters NOS, especially as it's all unseen.

Option 2 makes a mockery of my first list, he states the rod is 125 long but others here say the rod should be 130 long(Yes Simmo, rods are measured centre to centre), he then says he can do rod kits for the 400 as well so I think a lot of those early year 250's should be a different rod.

I'm now assuming the 250's in this list use the 125 long rods and the others the 130 rods??

Part # = 431-11651-00-00
Part Description = ROD,CONNECTING
Model Count = 29
DT1 1968 250 DT1 Dual Purpose
DT1B 1969 250 DT1 Dual Purpose
DT1C 1970 250 DT1 Dual Purpose
DT1C-MX 1970 250 DT1MX Dual Purpose
DT1E 1971 250 DT1 Dual Purpose
DT1MX 1971 250 DT1MX Dual Purpose
DT1S 1969 250 DT1S Dual Purpose
DT2 1973 250 DT2 Dual Purpose
DT2MX 1972 250 DT2MX Dual Purpose
DT3 1973 250 DT3 Dual Purpose
DT360A 1974 360 DT360 Dual Purpose
IT400C 1976 400 IT400 Dual-Purpose
IT400D 1977 400 IT400 Dual-Purpose
IT400E 1978 400 IT400 Dual-Purpose
MX250A 1974 250 MX250 Off-Road
RT1 1970 360 RT1 Off-Road
RT1B 1971 360 RT1 Off-Road
RT1M 1970 360 RT1M Off-Road
RT1MX 1971 360 RT1MX Off-Road
RT2 1973 360 RT2 Off-Road
RT2MX 1972 360 RT2MX Off-Road
RT3 1973 360 RT3 Off-Road
YZ250A 1974 250 YZ250 Competition Motocross
YZ250B 1975 250 YZ250 Competition Motocross
YZ360A 1974 360 YZ360 Competition Motocross
YZ360B 1975 360 YZ360 Competition Motocross
YZ400C 1976 400 YZ400 Competition Motocross
YZ400D 1977 400 YZ400 Competition Motocross
YZ400E 1978 400 YZ400 Competition Motocross

One problem with the above list is the DT1's , they use a 130mm long rod with the pin hole in the piston 5mm closer to the top.
Some of the 125mm rods have a 24mm pin and some have 25mm pin.
Good news is that I haven't seen a Yamaha crank from late 60's on that I haven't been able to match an after market rod kit to. The 465/490 are a different kettle of fish though, no longer available after market but there is a rod that goes close.

[yamaico]

Hi Simo,
I put a ProX rod kit in my 400, because I had a DT crank with a YZ barrel and the DT and YZ rods are a different length. Unfortunately I am O/S at the moment and not back for three weeks but I have the kit number written down at home. I can have a look as soon as I get back if that's any good to you.
Pete.

[Lozza]

Maico 250 rod 

[Simo63]

Hi Simo,
I put a ProX rod kit in my 400, because I had a DT crank with a YZ barrel and the DT and YZ rods are a different length. Unfortunately I am O/S at the moment and not back for three weeks but I have the kit number written down at home. I can have a look as soon as I get back if that's any good to you.
Pete.

Thanks Pete

[Simo63]

Maico 250 rod 

Thanks Lozza but a bit too cryptic for me mate   Are you saying a certain model Maico 250 rod will do the trick?

[ARN]

Is the rod on the right the replacement? Seems to have more meat around the bearing journals.


rod on right is genuine 400d and left is 250 L (1983 on to at least 86) as you noticed the web is thicker on standard ,the other difference is little end bearing outside diam. is larger ,they are same length. you could use a complete kit for 250 only thing to still check is big end pin length,

[Viper666]

The first option is a lot of dollars just to be able to use the letters NOS, especially as it's all unseen.

Option 2 makes a mockery of my first list, he states the rod is 125 long but others here say the rod should be 130 long(Yes Simmo, rods are measured centre to centre), he then says he can do rod kits for the 400 as well so I think a lot of those early year 250's should be a different rod.

I didn't do any homework on these just merely passed on the links. Without sounding flippant it's up to Simo to check with the guy if it is indeed the right one. The second guy says he now has 400 kits. Like anything we buy, especially ebay an OS etc. you need to do as many checks as possible.

No different than buying from a local shop when it comes to VMX stuff. I had an almost toe to toe with the Yamaha guy because he said the head gasket for a YZ125F & E were the same. I said they weren't & he went on about him being the expert & that's what the part list saying. I made him order the part number I had & he made me pay in full upfront. The part turned up, it was correct & the so called expert was nowhere to be seen.

My point is that with the old stuff you have to do as many checks as humanly possible & even then it may still be wrong.

I got a kit from a UK web site a few years back. I'll see if I can find it.

[shelpi]

ring Yamaha Pitmans in South Australia, they sell ProX kits and will be able to tell you whats what

[sleepy]

I found my info on the YZ400 cranks. I have it as 130mm long, pin 25 x 60 mm , width 20mm, small end 22mm. As I mentioned before I used either a prox or hotrod from the 83 -87 YZ250. Only difference is the small end at 23(comes with an 18mm bearing) and it is a bit lighter.

Maico 250 rod is a bad match. I have it down as 2mm longer and only 17mm wide.

[Simo63]

I found my info on the YZ400 cranks. I have it as 130mm long, pin 25 x 60 mm , width 20mm, small end 22mm. As I mentioned before I used either a prox or hotrod from the 83 -87 YZ250. Only difference is the small end at 23(comes with an 18mm bearing) and it is a bit lighter.

Maico 250 rod is a bad match. I have it down as 2mm longer and only 17mm wide.

Okay thanks Sleepy.

A few updates.  Had the rod measured again .. I was REALLY hoping that we had a rare long stroke version of the YZ400D motor  .. but alas .. not to be ... yes it's 130mm long when it was measured again  :'(

So the young bloke is going to order a 83-87 ProX YZ250 rod kit and we can go from there.

Many thanks for everyone's input into this, the comments, the measurements, the links and most of all, the good will .... sincerely appreciated guys    It's guys like you all that make this forum awesome

[yamaico]

Hi Simo,
Rang my wife and got the details from her. The ProX kit number is 03.2304. The OEM reference is 24Y-11651-01.
Pete.

[Big Scotty]

I dropped my crank in Thursday to get rebuilt then come home and started reading this thread, anyway I now expect a phone call this week to tell me some bad news ,can't find a rod kit,so I'm going to sound all smart and say try these ones, if he finds one ill put up were and what he found.
Cheers scotty

[Lozza]

Maico 250 rod 

Thanks Lozza but a bit too cryptic for me mate   Are you saying a certain model Maico 250 rod will do the trick?

Pretty sure there is only 1 Maico rod common across 250-490    Longer your rod the better..........